Nameserver (NS) Check

Look up a domain's nameservers and check their consistency.

NS Check looks up which authoritative nameservers a domain is delegated to, in real time. Every DNS record for a domain (A, MX, TXT and so on) is ultimately answered by these nameservers, so knowing what the NS records are is the starting point for troubleshooting DNS. Check individual record values with DNS Record Lookup and registrar metadata with WHOIS / Domain Lookup.

It is especially useful when moving a domain or switching DNS hosting: confirm that the NS records registered at your registrar match the nameservers actually answering on the internet. Just enter a domain — no protocol or path needed.

Domaine.g. example.com (domain only, no protocol or path)

NS records and delegation

NS records tell you which nameservers the parent zone (e.g. .com) has delegated the domain to. There are usually two or more for redundancy, so that one nameserver going down does not take the domain offline. The values shown here are the delegation seen by a public resolver, and they should match what is configured at your registrar.

Changing nameservers — run both during propagation

When you switch nameservers, resolvers worldwide keep querying the old ones for as long as the delegation was cached (typically 24–48 hours). Until propagation finishes you must keep the same records (A, MX, TXT, etc.) on both the old and new nameservers, or some users will see the site or mail go dark. Configuring only one side causes intermittent outages. Track how far the delegation has spread with DNS Propagation Check.

Confirm the NS at your registrar matches the NS at your DNS host
Keep identical records on the old and new nameservers during propagation
Zero nameservers means the domain is undelegated or does not exist

Frequently asked questions

It shows zero nameservers.

The domain may not be delegated yet (no NS set at the registrar), or the domain itself may not exist. Check your registrar configuration and whether the domain has expired.

The result differs from the NS at my registrar.

If you changed nameservers recently, the change may still be propagating. Public resolvers can cache the old delegation; it usually reconciles within 24–48 hours.

Does the order of nameservers matter?

No. Resolvers pick among them arbitrarily based on response time and other factors. This tool sorts them only for readability — there is no priority.

Can it look up internal domains?

No. Only public internet DNS is queried. Your input is not stored beyond the lookup and is not sent anywhere else.